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Unformatted text preview: 8. Frequency hopping requires multiple carrier frequencies. A. True B. False 9. DSSS spread the frequency of a signal BEFORE the modulation. A. True B. False 10. In CDMA, users' signals are overlapped in both time and frequency domain. A. True B. False 11. Framing means to identify the beginning and end of each frame from a bit stream. A. True B. False 12. HDLC framing is based on a special pattern "01111110", to make sure that this pattern does not appear in the data part of a frame (payload), what operation is needed? 13. Given a sequence 011111101111100, what is the result after bit stuffing? 14. Parity check can correct bit errors. A. True B. False 15. CRC can correct bit errors. A. True B. False 16. In CRC, if P(x)=x^5+x+1, then it must be able to detect single bit errors. A. True B. False 17. In CRC, if P(x) = x^3 + x +1, and the error pattern is 10110000, then the error can be detected. A. True B. False...
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- Spring '09
- Signal Processing, TDM, Multiplexing